242831987 has 2 divisors, whose sum is σ = 242831988. Its totient is φ = 242831986.

The previous prime is 242831947. The next prime is 242832013. The reversal of 242831987 is 789138242.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 242831987 - 2⁸ = 242831731 is a prime.

It is not a weakly prime, because it can be changed into another prime (242831947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121415993 + 121415994.

It is an arithmetic number, because the mean of its divisors is an integer number (121415994).

Almost surely, 2^242831987 is an apocalyptic number.

242831987 is a deficient number, since it is larger than the sum of its proper divisors (1).

242831987 is an equidigital number, since it uses as much as digits as its factorization.

242831987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 193536, while the sum is 44.

The square root of 242831987 is about 15583.0673168026. The cubic root of 242831987 is about 623.8812943644.

The spelling of 242831987 in words is "two hundred forty-two million, eight hundred thirty-one thousand, nine hundred eighty-seven".